We completed the second round
of the symmetry detection competition and presented results at a dedicated
workshop hosted at the IEEE Conference on Computer Vision and Pattern
Recognition (CVPR) 2011 in Colorado
Springs, CO. The
competition was divided into three parts, each focusing on one of three
types of symmetries: reflection, rotation and translation respectively. We
received eight submissions for symmetry detection, three for reflection,
two for rotation and three for translation symmetry. Adding one baseline
algorithm to each symmetry group for comparison, we evaluated a total of
In comparison, tested
algorithms performed best on reflection symmetry, second best on rotation
symmetry and last translation symmetry. Looking at sub categories of
reflection symmetries, we found that one algorithm performed superior to
all other tested algorithms on real images with multiple reflection axis
present (judged on recall rate). Another algorithm outperforms all other
algorithms on real and synthetic images depicting only a single
reflection symmetry, when the number of false positives has been taken into
account (judged on precision rate).
We established a testbed for the evaluation of symmetry detection
algorithms, devised evaluation metrics and automated the evaluation process.
We tested our process on eleven algorithms and established a performance
baseline that can be used as reference for future work on symmetry
Completed CVPR 2011 workshop on 'Symmetry Detection from Real World Images'.
We have called for
participation in the first symmetry detection competition from all
researchers worldwide, especially students. Three types of symmetries are
targeted in real images: reflection, translation and rotation. The top winners of Round Two competition have received travel funds
from US NSF and presented their algorithms, results and analysis at the
Symmetry Detection from Real World Image workshop at CVPR 2011, Colorado
Springs, CO, held in June 2011.
Also see CVPR 2011 workshop.
A technical report has been
published summarizing method and results of the competition:
Test Image Sets:
The following are links to
archive files including all test images and groundtruth
files used in this competition. Please consult the included readme file for further information.
Reflection Symmetry (4.6MB)
Rotation Symmetry (0.4MB)
Translation Symmetry 1
Translation Symmetry 2a
(Building Facades for Frieze Detection) (6.4MB)
Translation Symmetry 2b
(Urban Buildings for Lattice Detection with manual initialization) (1.2MB)
Training Image Sets:
New Training data will be updated after CVPR 2011